Phenols and Ethers Test

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Phenols and Ethers Test - 4

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Weekly Quiz Competition

Question 1
1 / -0.25

Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form

A
secondary alcohols

B
primary alcohols

C
tertiary alcohols

D
None of these

Solution

Ketones are reduced to secondary alcohols.
Question 2
1 / -0.25

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?

A
CrO₃ in anhydrous medium..

B
Heat in the presence of Cu at 573K.

C
Pyridinium chlorochromate.

D
All of these

Solution

All of these are mild oxidizing agent which can oxidize alcohols to aldehyde and ketone.
Question 3
1 / -0.25

Ketones react with Grignard reagent to produce

A
secondary alcohols

B
tertiary alcohols

C
primary alcohols

D
None of the above

Solution
Question 4
1 / -0.25

In the reaction

A
Cleavage of O –H bond

B
They can donate a proton to a stronger base

C
Phenols are acidic in nature.

D
All of these

Solution

Phenols are acidic in nature so they react with bases to form phenoxide ion.
Question 5
1 / -0.25

What is the correct order of reactivity of alcohols in the following reaction?

A
1 °>2 °>3 °

B
3 °>1 °>2 °

C
1 °<2 °>3 °

D
3 °>2 °>1 °

Solution

Because 3^o carbocation is most stable.
Question 6
1 / -0.25

Phenol can be distinguished from ethanol by the reactions with _________.

A
Br₂ /water

B
Na

C
Neutral FeCl₃

D
A and C

Solution

(a), (c)
(a) Br₂ /water
(c) Neutral FeCl₃
Question 7
1 / -0.25

Primary alcohols are prepared by reduction of carboxylic acids. Though lithium aluminium hydride is a strong reducing agent, it is not used in the reaction. Because

A
it is an expensive reagent

B
only used for secondary and tertiary alcohols

C
yield is low

D
None of these

Solution

LiAlH₄ is quite expensive.
Question 8
1 / -0.25

The reaction C₂ H₅ ONa + C₂ H₅ I →C₂ H₅ OCH₅ + NaI is known as

A
Williamson 's synthesis

B
Grignard 's synthesis

C
Wurtz 's synthesis

D
Kolbe 's synthesis

Solution

Rxn of sodium ethoxide with alkyl halide is known as Williamsons synthesis.
Question 9
1 / -0.25

How many alcohols with molecular formula C₄ H₁₀ O are chiral in nature?

A
1

B
2

C
4

D
3

Solution

Here, again carbon is not chiral in nature.
So, only one alcohol is chiral in nature
Question 10
1 / -0.25

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method.

A
elimination competes over substitution and alkenes are easily formed

B
alkyl group is hindered.

C
alkyl group should be unhindered

D
None of these

Solution

Foe the given conditions elimination domintes over substitution. And alkenes are formed.

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Re-Attempt Weekly Quiz Competition

Phenols and Ethers Test - 4

Result

Phenols and Ethers Test - 4

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SHARING IS CARING

Question 1

secondary alcohols

primary alcohols

tertiary alcohols

None of these

Solution

Question 2

CrO3 in anhydrous medium..

Heat in the presence of Cu at 573K.

Pyridinium chlorochromate.

All of these

Solution

Question 3

secondary alcohols

tertiary alcohols

primary alcohols

None of the above

Solution

Question 4

Cleavage of O –H bond

They can donate a proton to a stronger base

Phenols are acidic in nature.

All of these

Solution

Question 5

1 °>2 °>3 °

3 °>1 °>2 °

1 °<2 °>3 °

3 °>2 °>1 °

Solution

Question 6

Br2 /water

Na

Neutral FeCl3

A and C

Solution

Question 7

it is an expensive reagent

only used for secondary and tertiary alcohols

yield is low

None of these

Solution

Question 8

Williamson 's synthesis

Grignard 's synthesis

Wurtz 's synthesis

Kolbe 's synthesis

Solution

Question 9

1

2

4

3

Solution

Question 10

elimination competes over substitution and alkenes are easily formed

alkyl group is hindered.

alkyl group should be unhindered

None of these

Solution

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CrO₃ in anhydrous medium..

Br₂ /water

Neutral FeCl₃